Bath tub



FIG. 1 is a top perspective view of a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof as seen from the bottom of FIG. 2;

FIG. 4 is a side elevational view thereof as seen from the right of FIG. 2;

FIG. 5 is a side elevational view thereof as seen from the top of FIG. 2;

FIG. 6 is a side elevational view thereof as seen from the left of FIG. 2; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a bathtub, as shown and described. 